[PATCH] MSVC compat: Allow lookup of friend types in enclosing namespaces

[Reid Kleckner]

================
Comment at: lib/Sema/SemaDecl.cpp:10740
@@ +10739,3 @@
+    // This tag should be declared in a namespace, which can only be enclosed by
+    // other namespaces.  Bail if something there's an anonymous namespace in
+    // the chain.
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Richard Smith wrote:
> Stray 'something'?
yeah

================
Comment at: lib/Sema/SemaDecl.cpp:10986
@@ +10985,3 @@
+        NamedDecl *ND = Previous.getFoundDecl();
+        Sema::SemaDiagnosticBuilder D =
+            Diag(NameLoc, diag::ext_friend_tag_redecl_outside_namespace);
----------------
Richard Smith wrote:
> `auto`?
It used to be `auto`, but I had to feed it into addFriendTagNNSFixIt, so I made it explicit.  I guess I can flip it back.

http://reviews.llvm.org/D4443